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positive [ˈpɑːzətɪv]

1 positive adjective
  • good or useful
  • thinking about the good qualities of someone or something : thinking that a good result will happen : hopeful or optimistic
  • completely certain or sure that something is correct or true

2 positive noun
  • something that is good or useful
  • the result from a test that shows that a particular germ, condition, or substance is present
  • a photograph that shows light and dark areas or colors as they look in real life